One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,4)(5,6)(7,8)(10,13)(14,16)(17,18)(19,26)(20,25)(21,27)(22,24)(23,30)(28,29)(31,32) involution — undirected(1,3)(2,4)(5,7)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19)(18,23)(20,28)(21,29)(22,30)(24,26)(25,32)(27,31) involution — undirected(3,7)(4,8)(9,11,12,15)(10,14,13,16)(18,24)(21,25)(23,26)(29,32)(2,6)(4,8)(17,20,22,27)(18,25,24,21)(19,28,30,31)(23,32,26,29)(1,4)(2,3)(5,8)(6,7)(17,19)(18,26)(20,31)(21,29)(22,30)(23,24)(25,32)(27,28) involution — undirected(1,2)(3,4)(5,6)(7,8)(17,21,22,25)(18,27,24,20)(19,29,30,32)(23,31,26,28)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.